Weissia phascopsis

R. H. Zander

Monogr. Syst. Bot. Missouri Bot. Gard. 11: 196. 1985,.

Basionym: Gymnostomum phascoides Drummond Musc. Amer., 12. 1828,
Synonyms: Astomum phascoides (Drummond) Grout Hymenostomum rostellatum var. phascoides (Drummond) Cardot Weissia rostellata var. phascoides (Drummond) W. D. Reese & B. A. E. Lemmon
Treatment appears in FNA Volume 27. Treatment on page 516. Mentioned on page 513, 517.

Leaves longlanceolate, base broadly elliptical, shoulders absent, distal laminal margins strongly and sharply incurved or inrolled, apex narrowly channeled, acute, mucro strong, of 6–10 cells; costal adaxial stereid band smaller than the abaxial; distal laminal cells 8–10 µm wide. Sexual condition cladautoicous. Seta short, 0.015–0.017 cm not including the vaginula. Capsule cleistocarpic, elliptic to ovoid with a long-rostrate apiculus.


Phenology: Capsules mature winter–spring.
Habitat: Soil
Elevation: moderate elevations

Distribution

V27 741-distribution-map.gif

Que., Sask., Ariz., Kans., Minn., Nebr., N.Mex., N.Y., Ohio, Okla., Tex., Va., Europe

Discussion

Some capsules of Weissia phascopsis show rudimentary peristomes, of 1–8 teeth, each of 1–2 articulations, which may vary in a tuft, and aborted spores were not seen. The possible hybrid origin of this species has been discussed by A. L. Andrews (1920, 1922, 1924, 1933). C. Williams (1966) found possible natural hybrids in Ontario between W. controversa and W. muhlenbergiana, which differed from W. phascopsis by the large number of abortive spores and rudimentary peristome teeth (16 with 4 articulations). The difference in number of teeth and articulations indicates that W. phascopsis is either not a hybrid or it has backcrossed to W. muhlenbergiana. H. A. Crum and L. E. Anderson (1981) gave a clear summary of the problem. Species previously placed in Astomum are here presented as separate species pending a better analysis of the genetic basis of differences in traits. The gametophyte of W. phascopsis is much the same as that of W. controversa, which supports a theory of hybrid origin of the sporophyte. Further evidence is the occasional rudimentary peristome. The sexuality, however, is cladautoicous. This, and the multiple identical sporophytes per turf, each with no or few aborted spores, argue against outcrossing. There is no evidence for differential timing of maturation and dehiscence of archegonia and antheridia.

Selected References

None.

Lower Taxa

None.
... more about "Weissia phascopsis"
not differentiated +
long-excurrent +  and short-excurrent +
Acute (?) +  and Channeled (?) +
long-rostrate +
Richard H. Zander +
R. H. Zander +
crescent +
smaller +
rhomboid +  and rectangular +
papillose +  and smooth +
usually slightly wider +
rectangular;ovate +
differentiated +
Gymnostomum phascoides +
obovoid +
cucullate +
cleistocarpous +  and stegocarpous +
elliptic;ovoid +
monoicous +, dioicous +  and sexual +
flat to bulging +
persistent +
6 (?) +  and 10 (?) +
elongate-rhomboid +  and elongate +
thicker +
tomentose +  and bare +
mucronate +
cladautoicous +  and sexual +
erect +  and incurved +
subquadrate;hexagonal +
Que. +, Sask. +, Ariz. +, Kans. +, Minn. +, Nebr. +, N.Mex. +, N.Y. +, Ohio +, Okla. +, Tex. +, Va. +  and Europe +
moderate elevations +
differentiated +
multicellular +
yellow +  and orange-red or red +
1 +  and 2 +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
concave;keeled;channeled;ovoid;lanceolate or lingulate +
long-ligulate +
spiraled +  and contorted +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
triangular +  and oblong +
reduced +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
dentate +  and entire +
short-conic;short-rostrate +
photosynthetic +
2 +  and 6 +
dioicous +, monoicous +  and sexual +
spiculiform +  and 2-fid +
lateral +  and terminal +
lateral +  and terminal +
red +, orange +  and yellow +
oblong-truncate +  and long-triangular +
Capsules mature winter–spring. +
Monogr. Syst. Bot. Missouri Bot. Gard. +
straight +
elongate +
0.015 cm0.15 mm <br />1.5e-4 m <br /> (0.017 cm0.17 mm <br />1.7e-4 m <br />) +
2 +  and 1 +
yellow +  and laminal +
rounded-triangular +  and rounded-pentagonal +
0 cm0 mm <br />0 m <br /> (1 cm10 mm <br />0.01 m <br />) +
Astomum phascoides +, Hymenostomum rostellatum var. phascoides +  and Weissia rostellata var. phascoides +
Weissia phascopsis +
species +
elliptical;short-ovate or cylindric +
0.1 cm1 mm <br />0.001 m <br /> (0.22 cm2.2 mm <br />0.0022 m <br />) +
semicircular +  and circular +
orange +  and yellow +
stemless +  and perigoniate +
brown;tan or yellow +
plant +  and cespitose +
occasionally smaller than the perichaetiate +